Strong's #3586: kechash (pronounced kekh-awsh')
from 3584; faithless:--lying.
Brown-Driver-Briggs Hebrew Lexicon:
ּׁ
kechâsh
1) deceitful, false, deceptive, lying
Part of Speech: adjective
Relation: from H3584
Usage:
This word is used 1 times:
Isaiah 30:9: "this is a rebellious people, lying children, children that will not"